Explosive actuated gun for driving anchoring or fastening elements into hard receiving material

ABSTRACT

An explosive-actuated gun, for driving anchoring or fastening elements into hard receiving material, includes a first gun part formed with a cartridge chamber arranged to receive a cartridge with a tight fit, and a housing part pivoted to the first gun part and containing the cartridge detonating mechanism. A two-arm pivoted lever is provided for extracting a spent cartridge, and has one arm engageable beneath the cartridge rim with the other arm, upon relative pivoting of the gun parts, cooperating with a stop on the housing part to pivot the lever. The housing part is formed with a slot receiving the stop for displacement parallel to the gun axis, and means limit such displacement of the stop under the bias of spring means which bias said stop outwardly.

United States Patent Priority Inventor Wolfgang Bayer Eschen, Pona, Liechtenstein 828,878

May 29, 1969 Jan. 19, 1971 Hilti Aktiengesellschafl s laanzkie h v June 4, 1968 Germany Appl. No. Filed Patented Assignee EXPLOSIVE ACTUATED GUN FOR DRIVING ANCHORING 0R FASTENING ELEMENTS INTO HARD RECEIVING MATERIAL 3 Claims, 1 Drawing Fig.

U.S. Cl

Int. Cl Field of Search References Cited UNITED STATES PATENTS 4/1961 Broughton 3,046,557 7/1962 Broughton et al. 227/11 3,216,140 11/1965 Termet 227/10X 3,235,154 2/1966 Mulno 227/10 3,302,840 2/1967 Sekiguchi et al 227/8 Primary Examiner-Granville Y. Custer, Jr. AtlorneyMcGlew and Toren ABSTRACT: An explosive-actuated gun, for driving anchoring or fastening elements into hard receiving material, includes a first gun part formed with a cartridge chamber arranged to receive a cartridge with a tight fit, and a housing part pivoted to the first gun part and containing the cartridge detonating mechanism. A two-arm pivoted lever is provided for extracting a spent cartridge, and has one arm engageable beneath the cartridge rim with the other arm, upon relative pivoting of the gun parts, cooperating with a stop on the housing part to pivot the lever. The housing part is formed with a slot receiving the stop for displacement parallel to the gun axis, and means limit such displacement of the stop under the bias of spring means which bias said stop outwardly.

EXPLOSIVE ACTUATED GUN FOR DRIVING ANCHORING OR FASTENING ELEMENTS INTO HARD RECEIVING MATERIAL BACKGROUND OF THE INVENTION A known type of explosive-actuated bolt-setting gun, for driving anchoring elements into hard receiving materials, such as steel, concrete, etc., is provided with a two-arm ejection lever journaled in a fulcrum for removing a spent cartridge having a tight fit in a cartridge chamber. One arm of this lever engages beneath the bottom edge or rim of the cartridge. while the other arm cooperates, responsive to pivoting of the gun part containing the cartridge chamber relative to the gun part containing the cartridge detonating mechanism. about an axis transverse to the longitudinal axis of the gun, with the stop on the gun part containing the cartridge detonating mechanism.

A disadvantage of guns of this type is that the cartridge, after it has been loosened from the tight fit in the cartridge chamber, either must be removed by hand or the gun must be held with the cartridge chamber down and the cartridge shaken out of the chamber. This is frequently time-consuming, because even the loosened cartridge still sticks in the cartridge chamber with a light friction fit.

There is also a known cartridge ejecting device which, acting in the axial direction of the cartridge, ejects the empty cartridge cases in a force-closed manner by means of a prestressed spring. However, since only moderately strong springs can be installed in the gun, due to the size of the gun and for reasons of economy, frequently it happens that the cartridge remains stuck in the cartridge chamber due to an excessively tight fit therein.

The subsequent removal requires cumbersome and time consuming manipulations. In order to insure a reliable operation of this ejecting device, it would be necessary to use car tridges which do not have a tight fit in the cartridge chamber after use. Such cartridges would have to be made of special materials and to have special forms. This would result in a disadvantageous price increase of the cartridges.

SUMMARY OF THE INVENTION This invention relates to explosive-actuated bolt-setting guns, for driving anchoring or fastening elements into hard receiving materials such as steel, concrete and the like, and,'

more particularly, to an improved, simplified and safer spent cartridge ejecting means for such a gun.

In accordance with the invention, the above-mentioned stop is slidably mounted in a rectangular slot or guide for limited displacement parallel to the longitudinal axis of the gun and against the bias of a spring. Due to the fact that the spring is prestressed during pivotal movement of the gun parts, a spring force is available, after mechanical loosening of the spent cartridge from its tight fit, to overcome the remaining light friction fit of the cartridge in the cartridge chamber. Thus, the cartridge is ejected from the cartridge chamber without the necessity either of shaking the gun or of performing other manipulations.

An object of the invention is to provide an improved explosive-actuated gun for driving anchoring or fastening elements into hard receiving material.

Another object of the invention is to provide such a gun including a novel cartridge-ejecting means.

A object of the invention is to provide such a gun including novel means for ejecting a spent cartridge having a tight fit in a cartridge chamber, and for performing such ejection responsive to pivoting of two pivotally interconnected parts of the gun and without further manipulation.

Another object of the invention is to provide such a gun in which a stop, cooperable with a spent cartridge-ejection lever, is slidably mounted in an oblong slot or guide for limited displacement parallel to the longitudinal axis of the gun and against the force of the spring.

A further object of the invention is to provide such a gun in which the spring is prestressed during pivotal movement of the gun parts to provide an effective spring force capable of over coming the remaining light friction fit of the cartridge in its chamber after mechanical loosening of the cartridge from its tight fit.

For an understanding of the principles of the invention, reference is made to the following description of a typical embodiment thereof as illustrated in the accompanying drawing.

BRIEF DESCRIPTION OF THE DRAWING In the drawing, the single figure is a partial side elevation view, partly in section, illustrating an explosive-actuated boltsetting gun embodying the invention.

DESCRIPTION OF THE PREFERRED EMBODIMENT The bolt setting gun illustrated in the drawing includes a front housing part land a rear housing part 2. The housing part 1 is pivotally mounted on a pivot or journal 3 in the housing part 2, and a barrel 4 is displaceably mounted in housing part 1 and has a slightly conical or frustoconical cartridge chamber 5 and a pivoted spent cartridge-ejecting lever 6. Lever 6 is pivotal about a pin 7, and has one arm 60 engageable beneath the bottom edge or rim 8a of 'a cartridge case 8. The other arm 6b of lever 6, which is biased by a spring 9, can be brought into operative engagement with an end face 11a of a stop 11. The stop 11, which is biased outwardly by a spring 12 and is formed with an oblong slot 13, can be displaced parallel to the gun axis in a guide formation in housing part2. Such displacement can occur until one or the other of the semicircular end edges 13a or 13b of slot 13 bears against journal 3.

The illustrated gun operates in a manner which will now be described. After an anchoring element has been driven in, the gun is removed from the target material and the front housing part 1 is turned in the direction of the arrow f. During this rotation, arm 6b of ejecting lever 6 comes into operative engagement with end face Ila of stop 11. Stop 11, biased by spring 12 in the direction of arrow h is pressed, during further rotation of housing part ,1, in a direction opposite to the direction of arrow h until the inner surface 13a of slot 13 en gages journal 3 and spring 12 is compressed to the maximum.

It is only by the further rotation of housing part 1 in the direction'of arrow f that the arm 6b of ejecting lever 6 is moved by the now stationary stop 11 in the direction of arrow h. Due to this movement, arm 6a of lever 6, engaged beneath the bottom edge of the rim of cartridge case 8, loosens cartridge case 8 from its tight fit. After cartridge case 8 has been loosened, spring 12 can relax so that stop 11 acts abruptly on arm 6b to move the latter further in the direction of arrow h. The arm 6a thus ejects spent cartridge case 8 completely from cartridge chamber 5, so that the gun is ready to receive a new cartridge.

Iclaim:

1. In an explosive-actuated gun, for driving anchoring or fastening elements into hard receiving material such as steel, concrete, and the like, of the type including a first housing part formed with a cartridge chamber arranged to receive a cartridge with a tight fit, a second housing part pivoted to the first housing part at a fulcrum and containing the cartridge detonating mechanism, and a two-arm pivoted lever for ejecting a spent cartridge and having one arm engageable beneath the cartridge rim, the other arm of the lever, upon relative pivoting of the housing parts, cooperating with a stop on the second housing part to pivot the lever: the improvement comprising, in combination, said housing part being formed with a guide slidably receiving said stop for displacement thereof parallel to the gun axis; means limiting such displacement of said stop; and spring means biasing said stop outwardly.

2. In an explosiveactuated gun, the improvement claimed in claim 1, in which said stop is formed with an elongated oblong slot, said means limiting displacement of said stop comprising a pin secured to the second housing part and engaged through said slot. 

1. In an explosive-actuated gun, for driving anchoring or fastening elements into hard receiving material such as steel, concrete, and the like, of the type including a first housing part formed with a cartridge chamber arranged to receive a cartridge with a tight fit, a second housing part pivoted to the first housing part at a fulcrum and containing the cartridge detonating mechanism, and a two-arm pivoted lever for ejecting a spent cartridge and having one arm engageable beneath the cartridge rim, the other arm of the lever, upon relative pivoting of the housing parts, cooperating with a stop on the second housing part to pivot the lever: the improvement comprising, in combination, said housing part being formed with a guide slidably receiving said stop for displacement thereof parallel to the gun axis; means limiting such displacement of said stop; and spring means biasing said stop outwardly.
 2. In an explosive-actuated gun, the improvement claimed in claim 1, in which said stop is formed with an elongated oblong slot, said means limiting displacement of said stop comprising a pin secured to the second housing part and engaged through said slot.
 3. In an explosive-actuated gun, the improvement claimed in claim 1, in which the outer end of said stop is beveled. 